c-Jun N-terminal kinase (JNK) is activated by diverse cell stimuli, including stress, growth factors, and cytokines. Traditionally, activation of JNK by stress treatment is thought to induce cell death. However, our recent data indicate that JNK's ability to sensitize cells to apoptosis may be, in part, cell cycle dependent. Here, we show that the majority of both paclitaxel- and UV-induced apoptosis can be inhibited by the pharmacological JNK inhibitor, SP600125, in MCF-7 cells. However… CONTINUE READING